Il 2022-06-15 09:42 Zhiyong Ye ha scritto:
I regenerated the thin volume with the chunksize of 64K and the random write performance data tested with fio 64k requests is as follows: case iops thin lv 9381 snapshotted thin lv 8307
As expected, increasing I/O size (to avoid r/m/w) greatly reduced the issue (the ~11% hit is due to metadata allocation overhead).
I don't see anything wrong, so I think you had to live with the previously recorded 10x performance hit when overwriting 4K blocks on a 64K chunk size thin volume...
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